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A simple machine has only one of the following.

1. Lever

2. Wheel and axle

3. Pulley

4. Inclined Plane

5. Wedge

6. Screw

A yo-yo is an example of a wheel and axle. A compound machine uses more than one of the above.

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14y ago
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Q: Why is a YO YO considered a simple machine?
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